<!DOCTYPE  html>
<html>
<head>
    <meta charset="utf-8">
    <title>过滤器</title>
</head>
<body>
    <div id="app">
        {{ date | formatDate }}
    </div>
    <script src="https://unpkg.com/vue/dist/vue.min.js"></script>
    <script>
        //在月份、日期、小时等小于10前补0
        var padDate = function(value){
            return value < 10 ? '0' + value : value;
        }
        var app = new Vue({
            el: "#app",
            data: {
                date: new Date()
            },
            filters:{
                formatDate: function(value){  //这里的value就是需要过滤的数据
                    var date = new Date(value);
                    var year = date.getFullYear();
                    var month = padDate(date.getMonth()+1);
                    var day = padDate(date.getDate());
                    var hours = padDate(date.getHours());
                    var minutes = padDate(date.getMinutes());
                    var seconds = padDate(date.getSeconds()); 
                    //将整理好的数据返回出去
                    return year + '-' + month + '-' + day + ''+ hours + ':'+ minutes + ':' +seconds;
                }
            },
            mounted: function(){
                var _this = this; //声明一个变量指向Vue实例this,保证作用域一致
                this.timer = setInterval(function(){
                    _this.Date = new Date();  //修改数据date
                },1000);

            },
            beforeDstroy: function(){
                if(this.timer){
                    clearInterval(this.timer); //在Vue实例销毁前，清除我们的定时器
                }
            }
        })
    </script>
    
</body>
</html>